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-rw-r--r--tests/projects/plugins/project/src/cpp/RandDemo.cc87
1 files changed, 87 insertions, 0 deletions
diff --git a/tests/projects/plugins/project/src/cpp/RandDemo.cc b/tests/projects/plugins/project/src/cpp/RandDemo.cc
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+++ b/tests/projects/plugins/project/src/cpp/RandDemo.cc
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+// RandDemo.cc
+// features:
+// * uses random() to get a random integer
+// * gets interactive user input
+// * uses ternary operator "q ? a : b"
+
+#include <iostream>
+#include <cstdlib>
+#include <ctime>
+
+using namespace std;
+
+#define ranf() \
+ ((double)random()/(1.0+(double)RAND_MAX)) // Uniform from interval [0,1) */
+
+int main()
+{
+ int outcome, N=0, count_in=0 ;
+ double fraction_in ;
+
+ // Initialise random number generator with value of system time.
+ srandom(time(NULL));
+
+ // Get user input in correct range.
+ while(N<1)
+ {
+ cout << "Input the number of experiments: ";
+ cin >> N;
+ }
+
+ // Perform N experiments.
+ for(int n=1; n<=N; n++)
+ {
+ double x = ranf();
+ double y = ranf();
+ outcome = ( x*x + y*y > 1.0 ) ? 0 : 1 ;
+ if(outcome==1) count_in++;
+ cout << outcome << "\t" << x << "\t" << y << "\t"
+ << count_in << "\t" << n << endl;
+ }
+
+ // Sample goto to raise a violation
+ goto L1;
+
+ //Sample switch with default
+ switch (bob)
+ {
+ case 1: {
+ cout << "1";
+ break;
+ }
+ case 2:
+ {
+ cout <<"2";
+ break;
+ }
+ default:
+ {
+ cout << "3";
+ }
+ }
+
+ //Sample switch without default
+ switch (bob)
+ {
+ case 1: {
+ cout << "1";
+ break;
+ }
+ case 2:
+ {
+ cout <<"2";
+ break;
+ }
+ }
+
+ //Integer variables must be converted (cast) for correct division
+ fraction_in = static_cast<double>(count_in)/N;
+
+ // Output results
+ cout << "# Proportion of outcomes 'in' "
+ << fraction_in << endl;
+ // Output results
+ cout << "# pi-hat = "
+ << 4.0 * fraction_in << endl;
+ return 0;
+}